EOS 650D, EOS M or Nikon D 3100?

I'll start by apologising for yet another which camera thread but I need help and quickly (looking to buy tomorrow)

Why?
My 14 yr old daughter is about to start photography at high school and is desperate for a "decent camera" for this for her birthday which is this weekend. She had in mind a full on DSLR until I started showing her the prices of them. Yes I know if it was bike parts for me it would top shelf but we are budget restrained on this particular issue, would like to get out of it for under $600Aus.

What?
We have several point and shoot and all of them let us down in low light photography. I still use my F717 but it's dated and the low meg count and the inability to change lenses hampers it somewhat. I also have an older (less than 10yrs) EOS 35mm with EF 75 -300 series 3 USM lense and a 28-80mm EF lense.
I have been doing a fair bit searching and I have narrowed it down to a choice of three by dollar value, obviously the htree in the title, Canon EOS 650D, EOS M or a Nikon D 3100. A link to a side by side comparison is here, sorry I would cut and paste but it is too large for me to manage that.

My thoughts.
Well I'm leaning towards the Canon's simply because even with the EOS M and the use of an adaptor I am able to use the lenses and speedlight flash I already have (yes I will be testing my existing lenses and flash to make sure they are actually compatible). Narrowing that down further I would probably get either the M 22m kit or the M 18-55mm kit. When I compare the M to the 650D, the features on the M seem to be better with a better ISO capability. I also think the size of the M would be better suited to the smaller hands of a 14yr old and with the 22mm lens on it's not that much bigger than many point and shoots which would lend it to being easier for her to put in a bag and take with her on general outings.

So what say the font of all knowledge that is the MTBR community? Also does anyone have any experience with the lens adaptor for the M, good or bad? I am also happy for any other suggestions or recommendations.

Canon is rolling out the new 70d's. That is going to open up many used 50d and 60d's. Either one is a spectacular camera, but if you don't need video, the 50d will be a wonderful camera that will last for years. My wife has the 50d with over 40,000 pictures on it. Check places like B&H for used cameras.

Thanks heyall for the suggestion. The 70d is available here and I think that is the reason why the 60 has come down so much in price already. This is as a present so I don't think she'll be too appreciative of "used" even if it does mean a better camera.

Thanks heyall for the suggestion. The 70d is available here and I think that is the reason why the 60 has come down so much in price already. This is as a present so I don't think she'll be too appreciative of "used" even if it does mean a better camera.

Out of interest what is B&H (I'm in Aus)?

I edited the post above. B&H is one of the most remarkable photo / video shops in the world. It is located in Manhattan. They have a good used and gray market business, in addition to virtually anything high end you could ever want.

As for used, I understand where you are coming from. There are people like me out in the world with original boxes and packing material that could be used to create an illusion of a new camera.

When ever anyone asks me what camera they should get, I always have the same two part answer.

1.) Which camera fits the users hands best?
2.) Do any friends or family members have a particular brand where "sharing" of lenses and other accessories can be used?

When I started into photography, I went the Nikon route because I liked the way it flet in my hands better. I did not know anyone who already had a DSLR, so that did not factor into my decision.

Also, if low light photography will be important. You will need to look into how various camera performed with high ISO settings. Also, the combination of /2.8 lenses will improve low light performance as well.

My favorite low light lens is my trusty 50mm /1.8 lens. I like to do night street photography. However, my 24-70 /2.8 is a close second.

IMO, you will want to invest in good lenses. They can last far longer than any body that you may purchase now. I am a believer to learn on an inexpensive body with decent lenses and then upgrade your body later. The lens value will hold much higher then a body, which depreciates very fast since new bodies are released every year or two versus lenses that may never change in 5-7 years or longer.

Thanks plasticman, that was where those prices are from (they include delivery) but I am hoping that a certain large chain camera chainstore will actually honour that big sign they have in the front of every shop, the one that lists why you should by a camera from them and first item is "We will match any genuine advertised price, even on-line". Won't be surprised if they weasel out some how, that will be about a $250 hit for them if I get the M with 18 - 55mm lens and adaptor. Glad to hear from someone that has bought from them because if the above won't price match I will be buying online.

Hammie, thanks for the advice, was kind of along the lines I was thinking re sharing lenses and hand fit / usability.